<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>state</title>
  <style>
    .title {
      background: #0f0;
      width: 200px
    }
  </style>
</head>

<body>
  <!-- 准备好一个容器 -->
  <div id="test"></div>

  <!-- 引入React核心库 -->
  <script type="text/javascript" src="../js/react.development.js"></script>
  <!-- 引入react-dom,用于支持react操作DOM -->
  <script type="text/javascript" src="../js/react-dom.development.js"></script>
  <!-- 引入babel，用于吧jsx转为js -->
  <script type="text/javascript" src="../js/babel.min.js"></script>

  <script type="text/babel">
    // 1.创建组件
    class Weather extends React.Component {
      // 初始化状态，在class类中直接赋值将key添加到constructor中
      state = {
        isHot: false
      }
      render () {
        const { isHot } = this.state
        return <div className="title" onClick={this.changeWeater}>今天天气很{isHot ? '炎热' : '凉爽'}</div>
      }
      // 自定义方法————要用赋值语句+箭头函数形式
      changeWeater = () => {
        const isHot = this.state.isHot
        this.setState({ isHot: !isHot })
      }
    }
    // 渲染组件到页面
    ReactDOM.render(<Weather />, document.getElementById('test'))
  </script>
</body>

</html>